Numerical modeling is applied to
investigate the impact of crystal and crucible rotation on the flow pattern and
crystal-melt interface shape in Czochralski growth of oxide semi-transparent
crystals used for piezoelectric and optical applications. Two cases are
simulated in the present work: the growth of piezoelectric langatate (LGT)
crystals of 3 cm in diameter in an inductive furnace, and the growth of
sapphire crystals of 10 cm in diameter in a resistive configuration. The
numerical results indicate that the interface shape depends essentially on the
internal radiative heat exchanges in the semi-transparent crystals.
Computations performed by applying crystal/crucible rotation show that the
interface can be flattened during LGT growth, while flat-interface growth of
large diameter sapphire crystals may not be possible.
Source:IOPscience
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